Scanning device



April 9, 1935. H, c. NIGHTINGALE '1,997,307

SCANNING DEVICE Filed Dec.A l5, 1953 orfani/#6 al i P/crvfs ATTORNEYS Patented Apr. 9, 1935 UNITED STATES NT OFFICE soANNING DEVICE y j Harry C. Nightingale, Paterson, N. J.

Application December V15, 1933, serial No. 702,493 j. Y

4 Claims. (C1. ,17a-6i4` My invention relates to a picture transmitting and receiving device in a simple and novel form and Vis accomplished by the rotation'of a single cylinder with lines cut on two .different angles equally spaced inside the wall of the cylinder. y

accomplish this purpose without any other mech- Y equal. Y

anism or moving parts, to wit: `without the use of gears, cams, mirrors, plurality lof cells, pluralityv of cylinders, reciprocatingor oscillating motions or discs or any otherV mechanical contrivances.

My inventionvis more fully` described in the following specications and drawingin which- Figure 1 is a hollow cylinder with a cutaway sectional View showing locationof masked neon light and the slots vor cuts through cylinder to outer surface.

' Figure 2 is end view of Figure l.

Figure 3 is the end View of cylinder and screen whereby one may view the picture.

Figure 4 is a. section of Figure #2 to illustrate the angular cut of line #l to be projected.

Figure 5 is a section of Figure #2 to illustrateY theangular cut of line #30 to be projected.Y

Figure 6 is a section of Figure #2 to illustrate 'the angular cut of line #60 to be projected.

Figure '7 is a mask or tube to confine the light source, having a fine slot to direct or allow a beam of light outward; the length of which is equal to the width of the picture.

Figure 8 shows a neon lamp or light source having a small cross section of A of Fig. ,8

Figures 7 and 8 are shown in the cutaway section of Fig. l in a fixed position for operation.`

Figure 9 is a section of the outer surface of Figure 1 with one of its cuts or slots passing the mask (Fig. 7) and the light source (Fig. 8) when mounted for operation Within the hollow cylinder as shown in Fig. 1 cutaway section.

To understand the operation of my invention it is to be borne in mind that any transmitted television picture is composed of a number of lines per picture. i

Y My specifications are based on a line, picture,whichL numbermay be increased or diminished.. M 'Y In Fig. 2, the innersurface of this cylinder has 60` slotsV equally` spaced to projectthe 60 lines of a picture. vThese slots arenot equally spaced on the outer surface in order to project 69 lines of light in sequence. ings enables machine to project 60 separate lines insteadof one line being repeated upon itself V60 times were the Aslotsequallyspvaced on insideand outside surfaceof cylinder. v. d

In Fig. 2 the spacingsbetwen slots C and D are equally spaced on the Y"inner surface, and when cut through to thei outer surface of cylinder, these spacings between slots F and G are not In Figure 1 a` portion of `the 6 0 slots are shown. Theseslots arecutat an angle of about()` degrees tothe axis of the cylinder. `These slots are parallel to each other but not equallyspaced on outersurfacef. 't'. .l

These slotsA not"being parallel, to center axis intersect the light beam which is directed outward from mask in Fig. 7. This mask is mounted parallel to the center axis.

As any of these 60 slots pass in rotation across the fixed light beam of Figure 7, it allows only a small portion of light to pass through. That portion of light moves from right to left or left to right according to the direction of rotation of the This arrangement of spacmotor. This moving light forms a traveling beam which produces one projecting line of the picture.

In Figure 1 these slots arecut through -in depth to the inner surface as shown in Figure 2, so that the outer surface is unequally spaced but cut through tothe inner surface equally spaced.

To determine the angular cuts on Fig. 2, place a cross section of the cylinder on any even surface and a fixed distance away from the center lay out the cross section of screen, whose center is common to the cylinder, such as in Fig. 3. The screen is laid out in 60 equal lines. The cylinder has 60 equalV spaces on its inner surface. At any of these 60 equal spaces on the inside surface of cylinder is placed upon a commoncenter. A line is projected back from'line I on screen to inner-surface of cylinder. This determines the angular cut for line #L The cylinder is then advanced oneequal division and a second line is projected to the common centerV as stated above. This will completey angle cut for line #2,. This procedure is carried out throughout the remaining 58 slots.

, light passes into the cylinder through the inter-V sections and actuates the photoelectric cell or y,

Method of operation In rotation of hollow cylinder Fig. 1, the lines or slots, 6 degrees of center to the axis cross the single light line or slot which is parallel to the axis, allowing light to pass only at theintersections. The rotation causes this intersected beam to move from end to end ofY each of these lines or slots and be projected on a screen.

These 60 slots or lines have an additional angle of about one degree: difference each, as shown in Fig. 2 which allows the lines to be rprojected in sequence. This operation of the cylinder is for receiving. 1

For transmitting, the photoelectric cell or othe similar device is substitutedv for -the neon lamp or light source, and an image or picture is focused on the outer surface of revolving cylinder. This other device, recording the modulations of light and shades, one line'at a time in sequence. Y

Having fully described my invention, what-I claim and desire to secure by Letters Patent, is:

1. A scanning system comprising a light source, a shield surrounding said source and having va single slit therein parallel tofthe axis `of the light source, a cylindrical member surrounding the shield Vand lhaving av plurality of-slots cut 4through the surface thereof, said slots being inclined at any angle to the axis of the drum, the inner edges of the slots being parallel and equally spaced from each other, successive slotslfl-zingv inclined at different angles to'theradial Vlines of a plane passes through the center of the cylinder and perpendicular to thefaxis thereof, means Vfor rotating *the cylinder. f Y

2. A scanning system comprising a light/source, a shield surrounding said 'source and having Aa single slit therein parallel `to the axis Vof the light source, a cylindrical member surrounding the shield and having a plurality of slots cut through the surface thereof, said slots beingv inclined at an angle to the axis of the drum, the inner edges of the slots being parallel and equally spaced from each other, successive slots being inclined at different angles to the radial lines of a plane passed through the 'center of the cylinder and perpendicular to the axis thereof, means for rotating the cylinder, thereby causing the intersection of the shield slit and a slot to form a moving light spot, and means for modulating the light source.

` 3. A scanning system comprising a light source, a shield surrounding said source and having a single slit'therein not parallel to the axis of the light source, a cylindrical member surrounding the shield and having a plurality of slots cut through the surface thereof, said slots being inclined at an angle to the axis of the drum, .the inner edges of the slots being parallel and equally spaced from each other, successive slots being inclined at different angles to the radial lines of a plane passed through the center of the cylinder andperpendicular to the axis thereof, means for rotating the cylinder, thereby causing the intersection ofthe shield slit and a slot to form a moving light spot, y and means vfor modulating the lightY source. l

. ,4. A scanning system comprising a light sensitive device, a shield surrounding said light sensitive device and having a single slit therein paralleltothe axis' of the light sensitive device, a

yHARRY C. NIGHTINGALE. 

